1.One Key override lockout function Data lockout override function
2.Tone/pulse transfer function
3.High DC voltage indication
4.High AC voltage alarm
5.Low voltage self-checking, automatic power off and energy-save design
6.Memory key(10 groups of 18 digits)
7.Telephone functions（Dialing, Receiving, Redial）
8.Caller telephone number display
9.Telephone number storage and dial function
10.Mute function
11.Tester test (AC V & DC V test, Insulation test, Open line test, Earth insulation)
12.Call user & talk
13.Check wire pairs

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